Re: [解題] 國三 圓
http://ppt.cc/wVt4
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設 OD = OA = r 且 AB = OC = 5
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則 CD = √(r^2 - 5^2 ) = OE
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又 OE + OA = 10
則 √(r^2 - 5^2 ) + r = 10
r = 25/4
圓面積 = (25/4)^2 * π
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